The latest iOS 9.3.3 Update is not a major update / upgrade for iOS 9.x.x users, as it just includes some bugs fixes and routine traditional improvements on iOS Firmware. You can also read and check the update file size in image attached below.

Apple iOS 9.3.3 Jailbreak

As we all know, Untethered iOS 9.3.3 Jailbreak is still just a dream, and no official iOS 9.3.3 Jailbreak Tool has been released from team "PanGu, TaiG and PP".

Apple iOS 9.3.3 Installation

All iOS-device users can get official iOS 9.3.3 OTA Update for iPhone, iPad and iPod touch by navigating to Settings >> General >> Software Update option.

Whereas, all iOS developers can go to iOS developer website for official iOS 9.3.3 Downloads. If you're iOS non-developer, then you can still install and activate iOS 9.3.3 without developer account UDID for free through iTunes.